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Canonical battery record · checked 2 September 2026

LR43 / AG12

The LR43 / AG12 family is 11.6 × 4.2 mm and alkaline. A same-size silver-oxide cell is a conditional substitute, not an automatic direct replacement.

LR43AG12186
Answer

LR43, AG12, 186 are the supported exact aliases for one 11.6 × 4.2 mm alkaline button cell. No other family is treated as an automatic replacement.

Top profile · Ø 11.6 mm
Side profile · 4.2 mm high
Original proportional profiles. Scale is consistent within this diagram; screen size is not a physical ruler.
Format
Alkaline button cell
Dimensions
11.6 × 4.2 mm
Voltage
1.5 V nominal
Chemistry
Alkaline manganese dioxide / zinc
Drain context
General-purpose alkaline; sloping discharge profile
Rechargeable?
No — primary cell; do not recharge.
Capacity context
Manufacturer-, load- and cut-off-specific; use the linked datasheet for a qualified figure.
Confidence
High

Equivalence and confusion matrix

Code or familyClassificationReason
LR43 · AG12 · 186Exact equivalentThese evidence-backed markings resolve to this one canonical record and share its cited physical and electrical specification.
SR43SW / 301Same size, different electrical familyThe 11.6 × 4.2 mm envelope matches, but the electrical families do not: Alkaline manganese dioxide / zinc at 1.5 V nominal versus Silver oxide / zinc at 1.55 V nominal. Physical fit is not equivalence.
SR43W / 386Same size, different electrical familyThe 11.6 × 4.2 mm envelope matches, but the electrical families do not: Alkaline manganese dioxide / zinc at 1.5 V nominal versus Silver oxide / zinc at 1.55 V nominal. Physical fit is not equivalence.
SR1136SW / 344Not equivalentThe physical envelopes differ (11.6 × 4.2 mm versus 11.6 × 3.6 mm). Do not force, stack or infer equivalence from a shared diameter or code pattern.
LR54 / AG10 / LR1130Not equivalentThe physical envelopes differ (11.6 × 4.2 mm versus 11.6 × 3.05 mm). Do not force, stack or infer equivalence from a shared diameter or code pattern.

Supported application context

  • Devices whose battery compartment or manual specifies LR43 or a listed alias

Application context is limited to the scope stated in Energizer 186 Product Datasheet; it is not a device compatibility claim.

This alkaline family is often sold beside a same-size silver-oxide option. The shared envelope explains the confusion, but the chemistry and voltage profile prevent an unqualified direct-replacement claim.

LR43/AG12 is the 11.6 × 4.2 mm alkaline family. SR43SW/301 and SR43W/386 share its envelope while changing chemistry, nominal voltage and drain classification; LR44 is 1.2 mm taller.

What the code means

LR43 is the IEC-style alkaline button-cell identity. The other codes listed here are evidence-backed commercial or manufacturer aliases, not separate battery sizes.

Discharge and drain behaviour

Alkaline button cells have a more sloping discharge curve than same-size silver-oxide cells. Runtime and delivered voltage therefore depend strongly on load and the device cut-off.

Capacity context: Manufacturer-, load- and cut-off-specific; use the linked datasheet for a qualified figure.

Substitution guidance

Treat only the listed aliases as exact. Same-size silver-oxide families differ in chemistry, nominal voltage and discharge behaviour; use one only when current device or manufacturer guidance permits it.

Fact-level evidence

Energizer 186 Product Datasheet

Published by Energizer; page 1, specifications and industry-standard dimensions drawing. Checked 2 September 2026. Independently presented facts only; publisher wording, layout and diagrams are not reproduced.

Corroborated against Energizer Battery Cross Reference Guide; page 2, LR43 replacement-code row.

Open primary source Open corroborating source
Not a device-fit guarantee.

Confirm the exact code, chemistry and drain requirement with the device maker. Keep button and coin cells away from children and never recharge this primary cell.